- Neuro-Optometric Rehabilitation Association
... which a person can select where to place his or her attention and, finally, where to aim and focus his or her eyes. The symptoms of visual and nonvisual system dysfunction following TBI often derive from subcortical or subconscious pathways dysfunctions that can be, by standard central eyesight testi ...
... which a person can select where to place his or her attention and, finally, where to aim and focus his or her eyes. The symptoms of visual and nonvisual system dysfunction following TBI often derive from subcortical or subconscious pathways dysfunctions that can be, by standard central eyesight testi ...
Neuroimaging of cognitive functions in human parietal cortex Jody C
... tools for mapping the human brain. Neuroimaging has been particularly successful in mapping cortical visual areas in the human occipital [1] and temporal [2] lobes. The human parietal lobes (excluding somatosensory regions, which are not discussed here), which traditionally fall into the category of ...
... tools for mapping the human brain. Neuroimaging has been particularly successful in mapping cortical visual areas in the human occipital [1] and temporal [2] lobes. The human parietal lobes (excluding somatosensory regions, which are not discussed here), which traditionally fall into the category of ...
- Stem-cell and Brain Research Institute
... head and stem of the calcarine sulcus by means of vertical penetrations, using stereotaxic coordinates. Two different eccentricities can be distinguished in peripheral area 17 injections. The M76LH injection was located in the dorsal leaf of the calcarine cortex subserving 10º–12º eccentricity (Falc ...
... head and stem of the calcarine sulcus by means of vertical penetrations, using stereotaxic coordinates. Two different eccentricities can be distinguished in peripheral area 17 injections. The M76LH injection was located in the dorsal leaf of the calcarine cortex subserving 10º–12º eccentricity (Falc ...
Some Analogies Between Visual Cortical and Genetic Maps
... are replicas of an ancient gene for a receptor protein. 31 The genes for the red and green receptor proteins are located adjacent to each other on the X chromosome and have a 96% sequence homology.32 Many individuals have up to three slightly different versions of the gene for the green receptor pro ...
... are replicas of an ancient gene for a receptor protein. 31 The genes for the red and green receptor proteins are located adjacent to each other on the X chromosome and have a 96% sequence homology.32 Many individuals have up to three slightly different versions of the gene for the green receptor pro ...
31 - UCL
... not seem to be any significant increase in regions where modalities overlap; rather, modality-specific areas have increased in size, and quite moderately in number; the number of cortical areas has probably not changed in New and Old World monkeys, which have evolved independently for over 30 millio ...
... not seem to be any significant increase in regions where modalities overlap; rather, modality-specific areas have increased in size, and quite moderately in number; the number of cortical areas has probably not changed in New and Old World monkeys, which have evolved independently for over 30 millio ...
mechanisms of visual attention in the human cortex
... The competition among multiple objects in visual cortex can be biased by both bottom-up sensory-driven mechanisms and top-down influences, such as selective attention. Functional brain imaging studies reveal that, both in the absence and in the presence of visual stimulation, biasing signals due to ...
... The competition among multiple objects in visual cortex can be biased by both bottom-up sensory-driven mechanisms and top-down influences, such as selective attention. Functional brain imaging studies reveal that, both in the absence and in the presence of visual stimulation, biasing signals due to ...
Gestalt Issues in Modern Neuroscience
... Ganzfeld by Metzger, 1930, and of figure-ground segregation by Ehrenstein, 1930) is the need for sufficient contrast of the visual stimulus. Unless the contrast of a stimulus is above threshold (absolute or differential), Gestalt factors cannot act on it. In order for structural (Gestalt) laws to be ...
... Ganzfeld by Metzger, 1930, and of figure-ground segregation by Ehrenstein, 1930) is the need for sufficient contrast of the visual stimulus. Unless the contrast of a stimulus is above threshold (absolute or differential), Gestalt factors cannot act on it. In order for structural (Gestalt) laws to be ...
Visually Induced Ocular Torsion
... All subjects responded with a torsional movement in the same direction as a static tilted stimulus. The response amplitude was small, only compensating for a minor portion of the stimuli tilt. The response was well conjugate for the right and left eye. In the first study, a visual scene enriched wit ...
... All subjects responded with a torsional movement in the same direction as a static tilted stimulus. The response amplitude was small, only compensating for a minor portion of the stimuli tilt. The response was well conjugate for the right and left eye. In the first study, a visual scene enriched wit ...
Primary Visual Pathway
... of on and off zones • Length cells - respond to length of a bar that was moved across a receptive field • Direction cells - respond to direction of a bar moving across the receptive field. ...
... of on and off zones • Length cells - respond to length of a bar that was moved across a receptive field • Direction cells - respond to direction of a bar moving across the receptive field. ...
Visual field testing
... Intelligence in older patients is always underestimated because the testing scenarios are set up for middle-aged/younger people—but elderly will do just as well if given more time GO SLOW for them! ...
... Intelligence in older patients is always underestimated because the testing scenarios are set up for middle-aged/younger people—but elderly will do just as well if given more time GO SLOW for them! ...
David Hunter Hubel. 27 February 1926 — 22 September 2013
... Subsequent work in the cat showed a continued modification of receptive field organization in the visual areas just beyond the primary visual cortex, and in at least one visual area beyond those. David and Torsten then largely switched to studying the monkey, first going back to the lateral genicula ...
... Subsequent work in the cat showed a continued modification of receptive field organization in the visual areas just beyond the primary visual cortex, and in at least one visual area beyond those. David and Torsten then largely switched to studying the monkey, first going back to the lateral genicula ...
Visual Cortex and Control Processes Stimuli in Opposite Visual
... increasing potential competition and the need for selection. The “filtering” property that distinguished targets from distractors in the bilateral condition was the elementary visual feature of line orientation, which differed by 90° and should thus allow for efficient attentional selection (see Dun ...
... increasing potential competition and the need for selection. The “filtering” property that distinguished targets from distractors in the bilateral condition was the elementary visual feature of line orientation, which differed by 90° and should thus allow for efficient attentional selection (see Dun ...
Document
... correct solution order, requiring a new search. Irrespective of component movements or their kinematics, task-related neurons encoded the serial order of the sequence. Neurons activated with sequence components (68%) differed in activity between search and repetition. Search-related activity occurre ...
... correct solution order, requiring a new search. Irrespective of component movements or their kinematics, task-related neurons encoded the serial order of the sequence. Neurons activated with sequence components (68%) differed in activity between search and repetition. Search-related activity occurre ...
PDF file
... for an interactive integration of top-down attention (both position-based and object-based) and recognition. Rather than the simulations of fMRI data, the engineering performance of recognition rate and attended spatial locations are presented in the experiment. However, the bottom-up featurebased a ...
... for an interactive integration of top-down attention (both position-based and object-based) and recognition. Rather than the simulations of fMRI data, the engineering performance of recognition rate and attended spatial locations are presented in the experiment. However, the bottom-up featurebased a ...
Visual Perception: Objects and Scenes
... Figure 2. Although it is equally possible to complete the occluded letter to make it P, B or R, most people perceive it as R since WORD is the most familiar English word rather than WOBD or WOPD. Therefore we can assume that this theory ...
... Figure 2. Although it is equally possible to complete the occluded letter to make it P, B or R, most people perceive it as R since WORD is the most familiar English word rather than WOBD or WOPD. Therefore we can assume that this theory ...
Neural Basis of Prosopagnosia: An fMRI Study
... Activation obtained for objects (B–E) and faces (G–J) compared green in the diagram), whereas faces compared to scrambled faces to control stimuli in the right hemisphere of a normal subject (B,G) activated two areas: the anterior part of the collateral sulcus and and in three prosopagnosic patients ...
... Activation obtained for objects (B–E) and faces (G–J) compared green in the diagram), whereas faces compared to scrambled faces to control stimuli in the right hemisphere of a normal subject (B,G) activated two areas: the anterior part of the collateral sulcus and and in three prosopagnosic patients ...
Specialization within the ventral stream: The case for the visual word
... studying the functional contribution of inferior temporal cortex to reading per se. The issue of the nature of the contribution of a given cortical sector to reading (e.g. Is it case-independent? Is it location-invariant? Does it code for single letters, or for graphemes, syllables, or morphemes?) c ...
... studying the functional contribution of inferior temporal cortex to reading per se. The issue of the nature of the contribution of a given cortical sector to reading (e.g. Is it case-independent? Is it location-invariant? Does it code for single letters, or for graphemes, syllables, or morphemes?) c ...
Local Field Potential in the Visual System
... occurs at a distant site. Electrical signals observed locally may thus be due to transmitted potentials from distant sources, in a process that is termed volume conduction. The degree to which LFP signals in the visual cortex are of local origin is a subject of current debate. On the one hand, vario ...
... occurs at a distant site. Electrical signals observed locally may thus be due to transmitted potentials from distant sources, in a process that is termed volume conduction. The degree to which LFP signals in the visual cortex are of local origin is a subject of current debate. On the one hand, vario ...
A non-invasive method to relate the timing of neural activity to white
... were oriented in the intercommissural (AC–PC) plane. The eddy current distortions between diffusion weightings were typically less than two voxels. Analysis of eye movement data The EOG data were low-pass filtered at 30 Hz and scored in MATLAB (Mathworks, Natick, MA) using a partially automated progr ...
... were oriented in the intercommissural (AC–PC) plane. The eddy current distortions between diffusion weightings were typically less than two voxels. Analysis of eye movement data The EOG data were low-pass filtered at 30 Hz and scored in MATLAB (Mathworks, Natick, MA) using a partially automated progr ...
Perceptual Expectation Evokes Category
... of the recognition process has been studied is with ambiguous images that gradually become disambiguated over several seconds. In the 1960s, Bruner and Potter (1964) found that when gradually reducing the blurriness of an image, the blurrier the image was when the sequence began, the longer it took ...
... of the recognition process has been studied is with ambiguous images that gradually become disambiguated over several seconds. In the 1960s, Bruner and Potter (1964) found that when gradually reducing the blurriness of an image, the blurrier the image was when the sequence began, the longer it took ...
Chapter 5 Learning to attend in primary visual cortex
... knowledge, it has not yet been investigated if and how neuronal responses in the visual cortex change as a result of learning within a single recording session. During a single learning session, neurons in frontal cortex change their responses (Chen and Wise 1996; Asaad et al 1998; Yotsumoto et al 2 ...
... knowledge, it has not yet been investigated if and how neuronal responses in the visual cortex change as a result of learning within a single recording session. During a single learning session, neurons in frontal cortex change their responses (Chen and Wise 1996; Asaad et al 1998; Yotsumoto et al 2 ...
Vigabatrin: The Problem of Monitoring for Peripheral Vision Loss in
... appearance even when alterations to visual field occur from Vigabatrin toxicity, retinal examinations may offer the best method for detection of Vigabatrin toxicity in nonverbal patients. Changes to the optic nerve may occur, as may thinning of the nasal retinal nerve fiber layer, termed “inverse op ...
... appearance even when alterations to visual field occur from Vigabatrin toxicity, retinal examinations may offer the best method for detection of Vigabatrin toxicity in nonverbal patients. Changes to the optic nerve may occur, as may thinning of the nasal retinal nerve fiber layer, termed “inverse op ...
A Self-Organizing Neural Network That Learns to
... stage of visual processing. (Marshall, 1991) describes evidence that suggests that the same early processing mechanisms maintain a representation of temporarily occluded objects for some amount of time after they have disappeared behind an occluder, and that these representations of invisible object ...
... stage of visual processing. (Marshall, 1991) describes evidence that suggests that the same early processing mechanisms maintain a representation of temporarily occluded objects for some amount of time after they have disappeared behind an occluder, and that these representations of invisible object ...